Patent · US Active

Multipass laser amplifier and no-optical-power beam steering element

US12126135B2 · kind B2 · utility

0Cited by

3References

16Claims

0Family size

Assignee

Coherent Kaiserslautern GmbH · DE

Inventors

Christoph Schäfer · Coburg, DE
Louis McDonagh · Kaiserslautern, DE
Ralf Knappe · Kaiserslautern, DE

Key dates

Filing date	Oct 23, 2020
Grant date	Oct 22, 2024
Priority date	—
Expiry date	Mar 22, 2043

Classification

Technology area (CPC H)Electricity
CPC primaryH01S2301/03
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A multipass laser amplifier includes a mirror, a mirror device, a gain crystal, and refractive or diffractive beam-steering element. The gain crystal is positioned on a longitudinal axis of the multipass laser amplifier between the mirror and the mirror device. The beam-steering element is positioned on the longitudinal axis between the gain crystal and the mirror device. The beam-steering element has no optical power and deflects a laser beam, by refraction or diffraction, for each of multiple passes of the laser beam between the first mirror and the mirror device, such that each pass goes through the gain crystal for amplification of the laser beam and goes through a different respective off-axis portion of the beam-steering element. The no optical power of the beam-steering element enables maintaining a large beam size in the gain crystal, thereby facilitating amplification to high average power.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.